Electric incandescent lamp



F. HARRISON ELECTRIC INCANDESCENT LAMP.

APPLICATION FILED JULY 8.1919.

1,362,303, I I Patented Dec. 14, 1920.

" UNITED, STATES PATENTTOFFICIE. I

rnANois IIAImIsON, or LONiON, ENGLAND, AssIeNon.'ro THE ALAnnIN'nENnw nm'c'rnrc LAMP OORPORATION LIMITED, or LONDON, ENGLAND.

ELECTRIC INcANnEscENg: i

. To all whom it corwem:

Be it known that I, FnAN'oIs H RRISON, a

. subject of the King of England, residing at London, England, have invented certa1n new and useful Improvements in Electric Incandescent Lamps, of which the following is a'speeification.

This invention relates to electric incan descent lamps and to a process and means for placing the-filament of such lamps in .position within the lamp in their repair. In

culty in the removal of the temporary supports from within the lamp and it is an object of the present invention to obviate the said difliculty by providing an improved process and means. \I

The present invention therefore provides a process for winding the filament upon permanent supports within an electric incandescent lamp for repairing the lamp, consisting in (at) removing the pip of the bulb and making a small opening at the bottom of the lamp by the use of a blow-pipe flame, b') securing to the end of the central stem within the lamp below the permanent filament-hooks, by the aid of heat, a pinwith a fusible head and a metal stalk to support a carrier, (a) mounting one or more temporary filament-hooks upon a carrier having a central tubular sleeve to slip on to and frictionally hold to the said stalk, (d) plhcing the said carrier upon the said stalk within the lamp, (6) subsequently winding the filament so that it engages the said temporary filament-hooks, setting it, disengaging it from the temporary filament-hooks and engaging it with the said permanent hooks and removing the temporary hooks with their carrier from within the lamp.

By way of illustrating the present invention one mode of carrying itinto effect, is now described in some detail with reference to the accompanying drawings, in which Figure 1 illustrates the support or downwardly directed stalk;

Specification of Letters Patent. Pat ht d D 7 1 'Application filedJfily 8, 1919. Serial No. 809381. i

' Fig.2 shows the carrier with the temporar filament-hooks;

ig. 3 shows a lamp withthe pip end of;

port or downthe bulb open, and the -sup wardly. directed stalk attached to the end of the central stem; and

Fig. 4 shows the carrier with the temporary filament-hooks in position upon the support or downwardly directed stalk;'

/ A short length of nickel wire .A is provided with a glass bead B so that it has the appearance of a short glass headed pin.

A small fiber disk C is prepared and fitted with a central tubular sleeve D extending at right-angles to the plane of the'disk and of such a bore as to slip friction-tight on to the nickel wire or pin A. Hooks of copper .E are cemented to the fiber disk (for example by sealing-wax C the hooks E being of such substance and dimensions as to constitute temporary filament-hooks stiffer than the permanent lower ones F within the lamp.

An opening G is made in the pip end of the lamp, the diameter of the opening being quite small, in the nei hborhood of between 9; and i of an inch. blow-pipe jet is applied to the bottom of the central glass stem H Within the lamp to soften it and the nickel pin A is at the same time introduced by a suitable tool into the lamp through the said hole G and fused on to the bottom of the stem H by means of its own glass head B.

The said temporary hooks E are then bent down upon their carrier to enable them to be passed through the hole G and the carrier is slipped on to the pm A, its tubular sleeve D being threaded onto the pin A and pushed into gentle frictional engagement therewith, as shown in Fig. 4. The temporary hooks E are then bent so as to extend into close proximity with the permanent hooks F and the filament is threaded in the known manner upon these temporary hooks E and the permanent hooks J at the far end of the central glass stem H, the ends of the filament being secured in the spring clips K K illustrated in Fig. 3, and previously referred to in United States Patent No. 1,247,956. The remaining steps of setting the filament, and transferring it to its permanent supports are those that are already known.

After thesehave been carried out the carrier (including the" fiber disk C, tube D, cement C and temporary hooks E) is withdrawn'from the nickel pm A and out from the lamp through the hole G aforesaid. The nickel in A is conveniently-left secured to theend of the. central stemH where it may serve for a subsequent renewal of the filament in the same manner.

Throughout this. s ecification the expressions upper and l pressions relating to relative positions are employed on the supposition that the lamp is hanging with its cap uppermost and its pip end downward.

The fact tha't't he center stem of the lamp is of glass renders it desirable that the at-.

tachment ofthe pin to support the hook carrier shall be by fusion'of-glass in order that cate the selection of nickel as the substance for the pin. It will be obvious, however,

that other materials may be employed proower and similar ezi temporary filament hooks andwengaging it with said permanent hooks and removmg the temporary hooks with their carrier from withinv the lamp. i

2. The hereindescribed process as claimed inclaim 1 in which the pin has a stalk of metal such as nickeL, p p

3 The hereindesc ribed ,process as claimed in claim 1 in which the two free ends of the new filament are connected to the leading in wires by closely coiled helices each of whichggrip s between its convolutions one leading in wire and one end of the new-filament. I

4; The process of' renewing lamp filaments without removing the bulb, comprising vided they are such as will withstand the, making an o ening in the bulb, securing to al temperature changes, to which they are sub the stem wit int'he bulb and adjacent the hooks, the operation of withdrawing the.

former is renderedsimple and substantially such as to eliminate all danger of fouling either the filament after it has been transfe rred to the permanent supports, or the permanent supports themselves, The process is intended for repairing incandescent lamps, and especially incandescent lampswhose filaments are to be of drawn wire.

What I claim as my invention and desire to secure by Letters Patent is '1. The hereindescribed process df Winding a metallic filament upon the permanent supports within an electric incandescent lamp permanent filament hooks a pin adaptedto receive and support a temporary carrier,

placing on said pin a temporary carrier provided with filament supports, winding the filament so that it engages said supports, setting the filament and .then disengaging it y ing it withthe permanent filament hooks,

substantially as described.

In testimony whereof I affix my signature.

FRANCIS HARRISON. 

